Question

it is adviced that do not take a fountain pen in a flight why?​

Answer 1

The concern when flying with a fountain pen is ink leaking from the pen during flight due to cabin pressure changes. ... Because it is the air that expands with added pressure a full fountain pen has no air to expand and force the ink from the pen.

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Answer 2

Answer:

People are often advised not to carry fountain pens while travelling by air because when aeroplane ascends or descends, the pressure changes which affect the pressure inside the pen. These fluctuation of air pressure can cause leakage in fountain pens.